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首页> 外文期刊>IEEE Transactions on Geoscience and Remote Sensing. >A Model of Radar Backscatter of Rain-Generated Stalks on the Ocean Surface
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A Model of Radar Backscatter of Rain-Generated Stalks on the Ocean Surface

机译:海洋表面雨生茎的雷达后向散射模型

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In this paper, a model of radar backscattering from rain-generated stalks on the ocean surface in a rain field is proposed. In the model, stalks in the rain field form an array and are considered as finite water cylinders standing out of an infinite water surface. The radar backscattering coefficient from these stalks is derived. Both incoherent and coherent backscattering mechanisms from the stalks are considered. The model shows that the radar backscattering intensity is a function of the average distance between stalks on the water surface, the radar wave frequency, and the incident angle of radar waves. For light/moderate rain (at low rain rates), the radar backscattering intensity increases with increasing rain rate. For heavy rain (at high rain rates), the radar backscattering intensity decreases with increasing rain rate. The maximum radar backscattering intensity occurs at a rain rate that depends on the radar wave frequency and the incident angle of radar waves. The present model is used to explain the radar signatures of a rainfall event simultaneously observed by C-band ENVISAT (European satellite) Advanced Synthetic Aperture Radar (ASAR) and ground-based weather radar in the Northwest Pacific. The relationship between the radar return intensity extracted from the C-band ASAR image and the rain rate obtained from ground-based weather radar is in agreement with the model's calculation. Also, the air-sea interface in rain fields and its effects on the attenuation of radar backscattering are experimentally studied in the laboratory.
机译:本文提出了雨场中海面雨水产生的茎向后散射的雷达模型。在该模型中,雨场中的秸秆形成一个阵列,并被视为从无限水面突出的有限水柱。从这些茎中得出雷达的反向散射系数。考虑了来自茎的非相干和相干反向散射机制。该模型表明,雷达后向散射强度是水面秸秆之间的平均距离,雷达波频率和雷达波入射角的函数。对于轻度/中度降雨(低降雨率),雷达的后向散射强度会随着降雨率的增加而增加。对于大雨(高降雨率),雷达的后向散射强度会随着降雨率的增加而降低。最大雷达后向散射强度发生在降雨率上,降雨率取决于雷达波频率和雷达波的入射角。本模型用于解释C波段ENVISAT(欧洲卫星)先进合成孔径雷达(ASAR)和西北太平洋地面气象雷达同时观测到的降雨事件的雷达信号。从C波段ASAR图像中提取的雷达回波强度与从地面气象雷达获得的降雨率之间的关系与模型的计算相符。此外,在实验室中还研究了雨场中的海-气界面及其对雷达后向散射衰减的影响。

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